error

cc -I/usr/local/Cellar/tcl/8.5.13/include  -I/usr/X11/include -g -O2   -o modulecmd modulecmd-ModuleCmd_Avail.o modulecmd-ModuleCmd_Clear.o modulecmd-ModuleCmd_Display.o modulecmd-ModuleCmd_Help.o modulecmd-ModuleCmd_Init.o modulecmd-ModuleCmd_List.o modulecmd-ModuleCmd_Load.o modulecmd-ModuleCmd_Purge.o modulecmd-ModuleCmd_Switch.o modulecmd-ModuleCmd_Update.o modulecmd-ModuleCmd_Use.o modulecmd-ModuleCmd_Whatis.o modulecmd-ModuleCmd_Refresh.o modulecmd-cmdAlias.o modulecmd-cmdConflict.o modulecmd-cmdIsLoaded.o modulecmd-cmdInfo.o modulecmd-cmdMisc.o modulecmd-cmdModule.o modulecmd-cmdPath.o modulecmd-cmdSetenv.o modulecmd-cmdUname.o modulecmd-cmdXResource.o modulecmd-cmdUlvl.o modulecmd-cmdLog.o modulecmd-cmdChdir.o modulecmd-cmdTrace.o modulecmd-cmdVersion.o modulecmd-cmdVerbose.o modulecmd-cmdWhatis.o modulecmd-init.o modulecmd-locate_module.o modulecmd-utility.o modulecmd-main.o modulecmd-error.o modulecmd-getopt.o modulecmd-version.o -L/usr/local/Cellar/tcl/8.5.13/lib -ltcl8.5  -L/usr/X11/lib  -lX11  -lX11 
brew: superenv removed: -g -O2 -L/usr/X11/lib
ld: library not found for -lX11
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [modulecmd] Error 1
make: *** [install-recursive] Error 1

modules.rb

require 'formula'

class Modules < Formula
  homepage 'http://modules.sourceforge.net/'
  url 'http://downloads.sourceforge.net/project/modules/Modules/modules-3.2.10/modules-3.2.10.tar.gz'
  version '3.2.10'
  sha1 'a42b03cf59f10c4d06cd8cc1b176f172484a3205'

  depends_on 'tcl'

  def install
    system "./configure", "--prefix=#{prefix}"
    system "make install" 
  end

  def test
    system "module list"
  end
end